If the `versionComment` is left blank, the comment from the previous version populates. This is a bug as the comment from the previous version is not relevant to the new version and should instead be blank.
I only tested this bug in the R client. Here is code to repo if you set a parentID:
I am able to repro'. I also tried something similar via the web portal and did not reproduce the problem, so I am guessing it's a problem in the Python client logic (inherited by the synapser R package). We'll fix it in the Python client and release a new R package incorporating the update.